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=== tests/cases/compiler/fatarrowfunctionsOptionalArgsErrors1.ts ===
(arg1?, arg2) => 101;
>arg1 : Symbol(arg1, Decl(fatarrowfunctionsOptionalArgsErrors1.ts, 0, 1))
>arg2 : Symbol(arg2, Decl(fatarrowfunctionsOptionalArgsErrors1.ts, 0, 7))
(...arg?) => 102;
>arg : Symbol(arg, Decl(fatarrowfunctionsOptionalArgsErrors1.ts, 1, 1))
(...arg) => 103;
>arg : Symbol(arg, Decl(fatarrowfunctionsOptionalArgsErrors1.ts, 2, 1))
(...arg:number [] = []) => 104;
>arg : Symbol(arg, Decl(fatarrowfunctionsOptionalArgsErrors1.ts, 3, 1))
// Uninitialized parameter makes the initialized one required
(arg1 = 1, arg2) => 1;
>arg1 : Symbol(arg1, Decl(fatarrowfunctionsOptionalArgsErrors1.ts, 6, 1))
>arg2 : Symbol(arg2, Decl(fatarrowfunctionsOptionalArgsErrors1.ts, 6, 10))
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